---I got up at five this morning, I thought it was Friday.
---You _____ so early. It is Sunday today; you don’t have to go to work.
| A．mustn’t have got up | B．needn’t have got up |
| C．needn’t get up | D．mustn’t get up |
A new study finds that sitting can shorten a person’s life almost as much as smoking can, which _______ just how damaging inactivity can be.
| A．estimates | B．highlights | C．dominates | D．ensures |
The policy will _______a chain reaction of automatic spending cuts that can lead to thousands of job losses.
| A．set down | B．set off | C．set out | D．set about |
Landing safely in bad weather is a _______ task for any pilot, and even the smallest error can lead to a disaster.
| A．tricky | B．secure | C．significant | D．easy |
The discovery of the oil field, to the delight of the whole nation, will largely _______ the country’s dependence on imports of energy.
| A．adjust | B．affect | C．settle | D．ease |
One hundred percent _______ to your studies, though it can be lonely and no fun at all, will leave precious marks on your youth.
| A．commitment | B．attention | C．reference | D．reaction |